Why do people fall for these kinds of interpretations? That's easy. The Baha'i Faith had many things that sound like they are the new truth and revelation from God. Now, the problem is... how to prove it? They need to convince people that their prophet has fulfilled the prophecies from, not only Christianity, but from all the other major religions. But, if a person has already come to believe in the basic teachings of the Baha'i Faith, it is easy for them to keep on believing the deeper doctrines, beliefs, and interpretations of the Baha'i Faith.
But, I'm sure you know, Christians have done this with the Trinity and other Christian doctrines. Once a person has come to believe in Jesus as Savior, then in many Christian Churches, the next step is to teach the new believer how the Bible teaches that Jesus, and the Holy Spirit, are God. For them, it seems like a perfectly logical conclusion. And, one of the most important Christian doctrines there is.
Yeah, i still have my doubts about the Bahai faith and its origins from the Bab faith. It's heavily influenced by the Shia denomination of 'Islaam', and i see the Shia as a sect, i have no doubts about that. So i think the Bahai and Bab are maybe just to promote the Shia version of 'Islaam'.
I am no Sunni either. I do not follow any denominations anymore. I read the Gospel, Tora and Quran. And i also stopped going to Churches, Mosques and Synagogues, it's one big political mess, so much things which they do in their buildings which contradict 'their' Books. Sunnis, Catholics, Rabbis, they are all the same for me, and i think they hijacked the Scriptures for personal gains.
For example in Christianity they invented the trinity, in Islaam they invented the narrations, in Judaism they invented the talmud. Etc.
Anyways, it's their 'power'. The power of the masses is so powerful. People do not study, and most of the people can't read or write in the original language of the Scriptures. That's why they fall for translation errors/fabrications.
For example, the majority of Arabs do not even know how to read the Quran. They are uneducated. Also their 'scholars' teach in the mosques to follow only their interpretation. They literally say that you can't understand the Quran.
This was also the case in Christianity before the reformations here in Europe. They were telling them not to read, and they also couldn't read etc. all they had to do was being mislead every week when going to their churches.